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globalchange

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carbon(20)
fertilizers(16)
nitrogen(16)
irrigation(9)
biomass(8)
conservation(8)
carbon dioxide(7)
organic carbon(7)
organic matter(6)
precipitation(6)
agriculture(5)
cropping systems(5)
erosion(5)
soils(5)
vegetation(5)
density(4)
humidity(4)
isotopes(4)
landscape(4)
loess(4)
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